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Clearllab 10C Panel Markers and How They Are Combined

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Clearllab 10C Panel Markers and How They Are Combined WHITE PAPER ClearLLab 10C Panel Markers and how they are combined Mike Keeney London Health Sciences Centre, Victoria Hospital, London, ON, Canada Sandra Hernandez Beckman Coulter Inc. Life Sciences, Miami, FL 33196 IN THIS PAPER YOU WILL Experience the utility of the Discover the ClearLLab 10C Explore the power of optimizing ClearLLab 10C panel as an aid panel: the first 10-color CE-IVD your L&L immunophenotyping in the differential diagnosis of immunophenotyping reagents workflow with fewer steps, hematologically abnormal patients for assessing lymphoid and fewer tubes and more colors having or suspected of having myeloid populations certain hematopoietic neoplasms Introduction Flow cytometric immunophenotyping remains an indispensable tool for the diagnosis, classification, staging, and monitoring of hematologic neoplasms. There have been significant advances in flow cytometry instrumentation and availability of an expanded range of antibodies and fluorochromes that have improved the ability to identify different normal cell populations and recognize phenotypic aberrancies. ClearLLab 10C Panels consists of a set of four 10-Color reagents in dry unitized format, composed of antibodies directed against T, B, NK and Myeloid lineage antigens. These panels are designed to include the primary antibodies which are lineage oriented as per the 2006 Bethesda consensus. The combinations are intended to identify the leukocyte subpopulations that express these antigens alone or in specific co-expression patterns, and are designed to work with both normal samples and samples coming from any patient having or suspected of having the following hematopoietic neoplasms: chronic leukemia, acute leukemia, non-Hodgkin lymphoma, myeloma, myelodysplastic syndrome (MDS), and/or myeloproliferative neoplasms (MPN). The specific choices and combinations in the ClearLLab 10C Panels are based on the guiding principles of (1) addressing the clinical indications, (2) accounting for all major cell populations present in the specimen, and (3) providing sufficiently comprehensive identification of all major categories of hematopoietic cell populations in both normal and neoplastic states. (1-10) The normal cells within the sample act as an internal reference and can be used to determine whether a marker is brighter or dimmer than expected on a specific cell population. The inclusion of a backbone and redundant markers within the panels makes it easier to track populations between tubes, merge the data and troubleshoot unexpected results. In the panel the backbone of CD45 and CD34 are included in each tube. CD45 is used for consistent gating across all the four tubes. CD34 in combination with weak CD45 positivity can be used to confirm the hematopoietic origin of cells. Other redundant markers have been included in the panels such as CD13 and HLA-DR, in both M1 and M2 tubes. CD10 and CD19 are included in the lymphoid and myeloid tubes. CD19 in the myeloid tube is especially useful as it is aberrantly expressed in AML associated with t(8:21). (2) CD7 is included in the T cell tube as well as in the M1 cell tube to detect aberrant expression of CD7 in AML. CD200 can be useful in the differential diagnosis of B-cell neoplasms in particular atypical CLL vs Mantle Cell Lymphoma and was included in the B cell tube instead of CD23. (11) Both mature and immature markers are combined in the panels to provide efficiency as well as allowing for the identification of all cells in the tubes. The construction of the panel is centered on developing individual tubes within lineages that can be combined to yield an informative immunophenotype. 405 nm 488 nm 633 nm ClearLLab 10C PB Krome APC-A700 APC-A750 FITC PE ECD PC5.5 PC7 APC Panels (1) Orange (2) (3) B Cell Tube CD19 CD45 kappa lambda CD10 CD5 CD200 CD34 CD38 CD20 T Cell Tube CD3 CD45 TCRgδ CD4 CD2 CD56 CD5 CD34 CD7 CD8 M1 Cell Tube CD11b CD45 CD16 CD7 CD10 CD13 CD64 CD34 CD14 HLA-DR M2 Cell Tube CD19 CD45 CD15 CD123 CD117 CD13 CD33 CD34 CD38 HLA-DR The following case study obtained from clinical trial data highlights the utility of the ClearLLab 10C panel. Case study An 85-year-old male with known chronic lymphocytic leukemia for the past 10 years presents to a follow up appointment with anemia and bone pain. A complete blood count (CBC) and bone marrow aspirate and biopsy are collected for morphology. Additionally a bone marrow aspirate sample is submitted for flow cytometric immunophenotyping using ClearLLab 10C Panels. Patient Ref. Range WBC 12.9 4.0 — 10.0 x 109/L Hemoglobin 85 115 — 160 g/L Hematocrit 0.26 0.34 — 0.48 L/L MCV 87.5 80 — 100 fL Platelets 168 150 — 400 x 109/L WBC Differential Neutophils (incl. Bands) 2.4 2.0 — 7.5 x 109/L Lymphocytes 9.7 1.0 — 4.0 x 109/L Monocytes 0.7 0.2 — 0.8 x 109/L Eosinophils 0.1 0.0 — 0.5 x 109/L Basophils 0.1 0.0 — 0.1 x 109/L Flow Cytometry was performed and results were available within 2 hours, before the aspirate and biopsy results were available. Results for key markers are shown below. 405 nm 488 nm 633 nm ClearLLab 10C PB Krome APC-A700 APC-A750 FITC PE ECD PC5.5 PC7 APC Panels (1) Orange (2) (3) B Cell Tube CD19 CD45 kappa lambda CD10 CD5 CD200 CD34 CD38 CD20 (1) Pacific Blue* (2) APC-Alexa Fluor* 700 (3) APC-Alexa Fluor* 750 Visualize the Possibilities | 2 SS INT SS INT CD10-ECD CD20-AA750 CD45-KrO CD19-PB CD19-PB CD19-PB CD19-PB CD5-PC5.5 CD200-PC7 Kappa-FITC CD19-PB CD19-PB CD38-AA700 Lambda-PE Figure 1a: Key: Lymphocytes red, B cells orange, Monocytes green, Granulocytes blue, CD45 dim purple. Population of CD19+ cells (orange) dim/negative CD20, CD10neg, CD5 pos/dim, CD200 bright, CD38neg, lambda+. Consistent with a chronic lymphocytic leukemia population in this known CLL. SS INT SS INT CD5-PC5.5 CD20-AA750 CD45-KrO CD19-PB CD19-PB CD10-ECD Kappa-FITC CD38-AA700 CD19-PB CD34-APC Lambda-PE Figure 1b: The CD45 dim population (purple) is dim/negative, CD20, negative for CD19, CD5 and CD10. The bright CD38 positivity causes the CD34 to appear positive. However the CD45 dim population in this case appeared to react with the APC in each tube. Light chain expression is not interpretable on the CD45 dim population. 405 nm 488 nm 633 nm ClearLLab 10C PB Krome APC-A700 APC-A750 FITC PE ECD PC5.5 PC7 APC Panels (1) Orange (2) (3) T Cell Tube CD3 CD45 TCRgδ CD4 CD2 CD56 CD5 CD34 CD7 CD8 (1) Pacific Blue* (2) APC-Alexa Fluor* 700 (3) APC-Alexa Fluor* 750 Visualize the Possibilities | 3 SS INT SS INT SS INT SS INT CD2-ECD CD3-PB CD5-PC7 CD7-AA700 SS INT SS INT SS INT SS INT TCRgd-FITC CD4-PE CD8-AA750 CD56-PC5.5 Figure 2: The B cells (orange) are CD5 dim as seen in the B tube. The CD45 dim population (purple) is negative for all T cell markers except CD56. 405 nm 488 nm 633 nm ClearLLab 10C PB Krome APC-A700 APC-A750 FITC PE ECD PC5.5 PC7 APC Panels (1) Orange (2) (3) M1 Cell Tube CD11b CD45 CD16 CD7 CD10 CD13 CD64 CD34 CD14 HLA-DR SS INT SS INT SS INT CD16-FITC CD13-PC5.5 CD64-PC7 SS INT SS INT SS INT CD14-AA700 HLA-DR-AA750 CD11b-PB Figure 3: The CD45 dim population (purple) is positive for CD13 and HLA-DR. 405 nm 488 nm 633 nm ClearLLab 10C PB Krome APC-A700 APC-A750 FITC PE ECD PC5.5 PC7 APC Panels (1) Orange (2) (3) M2 Cell Tube CD19 CD45 CD15 CD123 CD117 CD13 CD33 CD34 CD38 HLA-DR (1) Pacific Blue* (2) APC-Alexa Fluor* 700 (3) APC-Alexa Fluor* 750 Visualize the Possibilities | 4 SS INT SS INT SS INT SS INT CD15-FITC CD123-PE CD117-ECD CD13-PC5.5 SS INT SS INT SS INT SS INT CD33-PC7 CD38-AA700 HLA-DR-AA750 CD19-PB Figure 4: The CD45 dim population (purple) appears to be weakly CD117 positive, CD13 positive and bright CD38 (arrow). Figure 5: H&E stain of bone marrow aspirate showing mainly small lymphocytes (orange arrow) and clumps of possible plasma cells (purple arrow). Cell at bottom center is a megakaryocyte (green arrow). Visualize the Possibilities | 5 Figure 6: H&E stain of bone marrow aspirate High power field (x100). Small lymphocytes (orange arrow) and plasma cells (purple arrow) are clearly seen. Discussion This 85 year old male who attended a routine follow up appointment for his long standing low grade chronic lymphocytic leukemia, which had been untreated, complained of bone pain and reported that he had been suffering from night sweats and weight loss over the past month. Flow Cytometry showed the expected CLL population CD19+, CD5+, CD20 dim, with dim monoclonal lambda expression. The CD45 dim population was positive for CD38+++, HLA- DR, CD56, CD13, and dim/negativeCD20. Other B, T and myeloid markers were negative and light chain expression was not interpretable; however follow up studies showed these to be positive for kappa on cytoplasmic staining. Taken together with morphology, with >20% plasma cells noted in the bone marrow, this case represents CLL that has developed a separate clone leading to myeloma in the same patient. Note: the CLL population expressed lambda light chains whereas the plasma cell population expressed kappa light chains, confirming two separate disease states and not evolution of the low grade CLL to myeloma. Visualize the Possibilities | 6 Conclusion Flow cytometric immunophenotyping can provide a sensitive tool to aid in the identification of the presence of hematologic malignancy and assist in demonstrating the absence of disease.
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